Trigger pump and breather valve dispensing assembly

ABSTRACT

A vent-valve for use with a plate member having an aperture therethrough. The vent-valve consists of a stem extending loosely through the aperture, and having on one side of the aperture an enlargement converging toward the aperture and adapted to seal the same. On the other side of the aperture of the stem has a resilient mushroom-like cap which bears against the plate member to bias the enlargement toward and into sealing relation with the aperture.

ilnited States Patent 1191 Davidson et a1.

, 54] TRIGGER PUMP AND BREATHER 3,504,822 4/1970 Haloski ..222/397xVALVE IS I G S L 3,320,097 5/1967 Sugalski.... ..220/44 R 3,245,5784/1966 Sutton ..222/397 X Inventors: Themes Devldsnn, Thernhlll;2,778,537 1 1957 Kanno ..222/207 x Alois A. Krawag Toronto 3,486,66312/1969 Humphrey.... ..222 207 Frederick Harold Humphrey Mark- 1,915,2496/1933 Jorgensen ..137/525 X ham, all of Ontario, Canada PrimaExaminerRobert B. Reeves [73] Assigneez Polypump Curacao N.V., W1llemrystad, Curacao, Netherlands Antilles f AttomeyS1m & McBurney [22] Filed:Feb. 17, 1971 21 Appl. No.: 116,112 [571 ABSTRACT A vent-valve for usewith a plate member having an 52 US. Cl ..222/207, 220/44 A, 222/209,aperture therethreugh- The vent-valve consists of a 222/4815 stemextending loosely through the aperture, and hav- 51 Int. Cl. ..B65d 3700 ing on one Side of the aperture an enlargement 58 Field of Search..220/44 A, 44 B, 44 c, verging toward the aperture and adapted to Sealthe 220 44 1 44 E 44 R, 9 R, 39 A; 222 207 same. On the other side ofthe aperture of the stem 209-212, 214, 383, 397, 481, 544; 137/525, hasa resilient mushroom-like cap which bears against 588; 251/320, 321 theplate member to bias the enlargement toward and into sealing relationwith the aperture. [56] References Cited 9 Claims, 7 Drawing FiguresUNlTED STATES PATENTS 2,571,893 11/1951 Kendall ..137/525 X 2 v Z/ t r-77/ PATENTED APR] 0 191a SHEET 1 [IF 2 INVENTORS FREDElucK Mow HUMPHKEYBY ALMS A. KRAWAGMA THuMAS N bmnosou & MB

Agen

PATENTEU 1 01973 3, 726,442

sum 2 or 2 FIG. 5

INVENTOR. FREDE-MCK HAROLD HUMPHKEY BY Mow A. KRAWAGNA THoMAs N. DPMDSQNTRIGGER PUMP AND BREATHER VALVE DISPENSING ASSEMBLY This inventionrelates generally to dispensing assemblies adapted to dispense liquid orsemi-liquid contents from a container in which they are stored. Morespecifically, this invention relates to an articulable triangulartrigger construction in which mutual reciprocation of the sides bothpumps the contents from a container and admits air to the container tooccupy the space from which the contents have been removed. A specialfeature of this invention is the construction of the vent-valve per se.

One object of this invention is to provide an articulable triangularconstruction which may be finger-actuated to both dispense the contentsfrom a container and admit air to the container.

A further object of this invention is to provide a means of locking thearticulable triangular construction in a position where pumping cannottake place, for purposes of shipping, handling, etc.

A still further object of this invention is to provide a vent-valveconstruction in which the vent is normally resiliently closed by thevalve.

The last of these'objects is accomplished by providing, in combination,a plate-like member having an aperture therethrough, a vent-valve havinga stem extending loosely through said aperture, the stem having on oneside of the aperture an enlargement converging toward the aperture andadapted to seal the aperture, the stem having on the other side of theaperture a resilient mushroom-like cap of which the periphery extendsoutwardly and toward the plate-like member and bears against theplate-like member, thereby to bias the enlargement into sealing relationwith the aperture.

The first of the above objects is accomplished by the provision of acontainer having pump means for pumping the contents of the containerfrom the interior to the exterior, the container including a plateportion separating the interior of said container from the exteriorthereof, the plate portion constituting one side of a triangular linkagein which the first and second sides are of constant length and the thirdside is of changable length by virtue of a pin-and-slot connection withthe first side, the plate portion defining said first side, the secondside being defined by a first swingable member hinged to said plateportion at the vertex between said first and second sides, the thirdside being defined by a second swingable member hinged to said firstswingable member at the vertex between said second and third sides andslidably pivoted to said plate portion at the vertex between said thirdand first sides, the second swingable member having an integral triggerwhich may be moved digitally to swing the first swingable member closerto said plate portion.

Two embodiments of this invention are shown in the accompanyingdrawings, in which like numerals denote like parts throughout theseveral views, and in which:

FIG. 1 is a perspective view, partly broken-away, of one embodiment ofthe dispensing assembly of this invention;

FIG. 2 shows a portion of the assembly of FIG. 1, with one of the partsin a locking position;

- FIG. 3 is a partly broken-away, exploded view of the components of theassembly, in accordance with the first embodiment;

' mounted thereon a dispensing assembly 12 which includes an internallythreaded cap member 14, a plate portion 15, a first swingable member 16pivoted to the plate portion 15 at a first pivot axis 18, a secondswingable member 20 pivoted to the first swingable member 16 at a secondpivot axis 21, a spray barrel 22, a spray nozzle 24, a depressable,self-restoring pump 26, and a vent-valve 28. Preferably, the first andsecond pivot axes l8 and 21 are integral web-hinges, and the first andsecond swingable members are moulded integrally with each other and withthe plate portion 15. FIG. 3 shows the position of these latter threeintegral elements in the as-moulded position. The plate portion 15 has arelatively flat upper surface 29 and has a first circular aperture 30and a second circular aperture 31. The second aperture 31 iscounter-sunk at 32 as shown.

Two curved positioning ribs 34 are integral with and 1 extend .upwardlyfrom the upper surface 29. Two breather ribs 36 are integral with andextend upwardly from the surface 29 on either side of the counter-sunksecond aperture 31. Extending upwardly from the right-hand edge of theplate portion 15 are two arms 38 which support two oppositely extending,coaxial pivot pins 40. Extending leftwardly from the flat upper surface29 is support structure 42 which terminates in an integral web-hinge 44,constituting the first pivot axis 18in FIG. 1.

The second swingable member 20 includes a trigger 56, two spaced-apartbrace members 58, and an arm 60 oriented substantially perpendicularlyto the brace members 58 and having two edge flanges 62 which are cutaway to define two slots 63.

Projecting rightwardly from the flat upper surface 29 between the arms38 is an elongated member 65 having a raised central portion 66.

FIGS. 5 and 6 show the lower construction of the plate portion 15. Adownwardly depending circular rim 68 is adapted to bear against theouter upper periphery of the cap member 14. The first aperture 30 issurrounded, on the lower side of the plate portion 15, by a downwardlyextending integral tube 70, which is adapted to communicate in turn witha suction tube 72 extending downwardly into the container 10. The plateportion 15 also has on its lower side a cylindrical extension 74 whichis coaxial with the integral tube and encloses both the first and secondapertures 30 and 31. At its lower edge, the cylindrical extension 74 hasan outwardly extending rib 75 which is adapted to catch under the inner,lower edge of a flanged collar 76 (shown in perspective in FIG. 3). Theflange 77 of the flanged collar 76 is adapted to bear against the innerunderside of the cap member 14, while the collar-76 itself extendsupwardly through a central opening 79 in the cap member 14, in snugrelation therewith. As can be seen in FIG. 5, when the rib 75 catchesbeneath the flanged collar 76, the cap member 14 is clamped, so tospeak, between the circular rim 68 and the flange 77 of the flangedcollar 76.

The depressable self-restoring pump 26 shown in FIG. 1 is composed oftwo elements. The first is the flat upper therethrough, the second is anintegral elastomeric member 80 shown in perspective in FIGS. 3 and 4.The integral elastomeric member 80 falls within the terms of US. Pat.No. 3,486,663, invented by RH. Humphrey, issued on Dec. 30, 1969, andentitled Elastomeric Pump and Check-Valve.

As can be seen particularly in FIGS. 4 and 5,'the integral elastomericmember 80 includes a bubble portion 82 and a flange 84 which extendsoutwardly and downwardly-from the bubble portion 82. The bubble portion82 defines a central cavity 85. As seen in FIG. 4, the integralelastomeric member 80includes a first sloping partition 87 on one sideof the cavity 85 and a second sloping partition 88 on the other side ofthe cavity 85. The partitions 87 and 88 are substantially parallel and,as seen in FIG. 5, are both sloped in the same direction with respect tothe flat upper surface 29 against which they are adapted resiliently torest. The integral elastomeric member 80 includes a U-shaped channelportion 90 extending radially away from the cavity 85 and openingthrough the flange 84. The integral elastomeric member 80 is adapted tobe positioned centrally within the curved positioning ribs 34 with theU-shaped channel portion 90 fitted over the raised central portion66 ofthe elongated member 65. When so positioned, it defines with the flatupper surface 29 a first chamber 92 which includes the cavity 85 and thevolume between the two sloping partitions 87 and 88, a second chamber 93located between the first sloping partition 87 and the flange 84, and athird chamber 95' between the second sloping partition 88 and the flange84, the third chamber 95 communicating with the U-shaped channel portion90. When the integral elastomeric member 80 is in position as shown inFIGS. 1, and 6, the raised central portion 66 of the elongated member 65does not totally block up the interior of the U-shaped channel portion90, and a passageway is left along the elongated member 65 communicatingwith the third chamber 95.

A shroud 97 is 4 adapted to hold the integral elastomeric member 80tightly against the flat upper surface 29, and for this purpose includesan annulus 98 defining a central opening 100 adapted snugly to fitaround the bubble portion 82, and an axially extending lip 102. Theannulus 98 and the lip 102 define a shoulder adapted to bear downagainst the flange 84 of the integral elastomeric member 80. The shroud97 also includes a pencylindrical channel 104 which is adapted snugly tosurround the U -shaped channel porsurface 29 with the first aperture 30'tion 90 and to define a full cylinder with the elongated member 65, thebottom surface of which has the same curvature as the pencylindricalchannel 104. Lip 102 of the shroud 97 is adapted to fit snugly withinthe curved positioning ribs 34, and is adapted to be tack-welded orheat-welded in position therebetween.

Attention is now directed to the vent-valve 28 shown in FIGS. 3, 5, 6and 7. The vent-valve 28 has a stem 106 dimensioned to extend looselyfrom the second aperture 31, the stem 106 having part-way along itslength an enlargement 108 which flanges conically upwardly as seen inthe Figures. At the upper end of the stem 106 as seen in the Figures thevent-valve 28 has a resilient mushroom-like cap 109 of which theperiphery extends outwardly and toward the enlargement 108. As best seenin FIGS. 5 and 6, the vent-valve 28 is adapted to be inserted throughthe second aperture 31 so that the enlargement .108 lies beneath theplate portion 15 while the resilient mushroom-like cap 109 liesv aboveit with its periphery resting on the breather ribs 36. In this position,it is possible for air to pass beneath the mushroom-like cap 109 betweenthe the breather ribs 36. The thickness of the plate portion 15, thedepth of the breather ribs 36, and the distance along the stem 106between the enlargement 108 and the mushroomlike cap 109, are all suchthat the enlargement 28, 7

whose maximum diameter is greater than the minimum diameter of thesecond aperture 31, is resiliently biased into the second aperture 31,thereby effectively stopping it up. This is accomplished by reason ofthe resiliency of the mushroom-like cap 109 which urges the enlargement108 into sealing relation with the second aperture 31 by getting apurchase on the breather ribs 36. So long as the enlargement 28 is insealing relation with the second aperture 31, as shown in FIG. 5, it isnot possible for air or liquid to pass through the aperture 31. As soonas the vent-valve 28 is moved downwardly with relation to the plateportion 15, however, the enlargement 108 is displaced below the secondaperture 31, and the latter'is opened for the passage of air or liquid.Naturally, it is not intended that liquid (i.e., the contents of thecontainer 10) should pass out of the container through the secondaperture '31. What is intended is that air from the outside should passinto the container through the aperture 31 when the vent-valve 28 islowered, in order to make up the extra volume created by the dispensingof the contents of the container 10.

Present-day moulding techniques require that the plate portion 15, thefirst swingable member 16 and the second swingable member 20 beintegrally moulded in the position shown in FIG. 3. When the vent-valve28 has been inserted into the second aperture 31, and the integralelastomeric member has been secured in place by tack-welding (orotherwise securing) the shroud 97 in the position indicated in FIGS. 1and 5, the assembly is closed into operating position by articulatingthe first swingable member 16 about the integral web-hinge 44 so that itcloses upon the plate portion 15 as shown in FIG. 1, and by causing theslots 63 in the second swingable member 20 to register with the pivotpins 40 supported on the arms 38 extending from the plate portion 15. Ascan be particularly well seen in FIGS. 5 and 6, the pivot pins 40 areslidably received within the slots 63, and this pennits the secondswingable member 20 to pivot slidingly about the pivot pins 40 between afirst position shown in FIG. 5 and a second position shown in FIG. 6. Itwill be noted that as the second swingable member 20 moves from the FIG.5 position to the FIG. 6 position, the pivot pins 40 slide more deeplyinto the slots 63. Also, as the second swingable member 20 pivots aboutthe pivot pins 40 in the Clockwise sense, the first swingable member 16is caused to pivot about the first pivot axis 18 (defined by theintegral web-hinge 44) in the clockwise sense, which brings it closer tothe plate portion 15.

As can be seen in FIGS. 3, 5 and 6, the support structure 42 of theplate portion includes a depressable tongue 112 which, when themechanism is assembled as shown in FIG. 5, bears resiliently against theupper wall portion 46 of the first swingable member 16, and tends tobias the latter in the counter-clockwise direction with respect to theplate portion 15.

It will be appreciated that, when the first plate portion 15 and thefirst and second swingable members 16 and are assembled in the positionshown in FIG. 5, they define a hypothetical articulable trianglemechanism of which the vertices are defined by the first pivot axis 18,the second pivot axis 21 and the pivot pins 40. This hypotheticaltriangle is articulable because of the pin-and-slot connection betweenthe second swingable member 20 and the plate portion 15. In effect, oneside of the triangle is defined by the plate portion 15 between thepivot pins 40 and the first pivot axis 18, a second side of the triangleis defined by the first swingable member 16 between the first pivot axis18 and the second pivot axis 21, and a third side of the hypotheticaltriangle is defined by the second swingable member 20 between the secondpivot axis 21 and the pivot pins 40. It will be appreciated that thefirst and second sides of the hypothetical triangle are of constantlength, whereas the third side as defined above is of adjustable lengthdue to the pin-and-slot connection.

Attention is now directed to FIGS. 5 and 6, which illustrate the mannerin whichthe pump operates. In the position shown in FIG. 5, it isassumed that the trigger 56 has just completed its swing in thecounterclockwise direction tothese positions shown, and thus that thefirst swingable member 16 has just moved upwardly to the position shownin FIG. 5 from the position shown in FIG. 6. In so doing, the distortedand depressed bubble portion 82 has restored itself almost to thenatural condition, and in so doing has caused the volume of the firstchamber 92 to increase. When the volume of the first chamber 92increases, it draws liquid (if such is the contents of the container)upwardly through the suction tube 72 and through the in tegral tube 70and aperture 30 into the second chamber 93, whence it passes beneath thefirst sloping partition 87 and into the first chamber 92. Upon thedownstroke from the position shown in FIG. 5 to the position shown inFIG. 6, the bubble portion 82 is distorted and depressed, therebydiminishing the volume in the first chamber 92, causing the firstsloping partition 87 to seat or wedge fimily against the flat uppersurface 29, and simultaneously forcing liquid out of the first chamber92 into the third chamber 95 beneath the edge of the second slopingpartition 88, as shown particularly in FIG. 6. From the third chamber95, the

liquid passes outwardly within the U-shaped channel portion 90 in thepassageway defined between the latter and the elongated member 65. Thecycle is then recommenced by releasing the trigger 56 and permitting thedepressable tongue 112 to restore the first swingable member 16 to theposition shown in FIG. 5, thereby also permitting the bubble portion 82to restore itself to the position shown in FIG. 5.

It will be noted that the wall of the bubble portion 82 is thickenedover a certain portion of its area as shown at 114, and this is merelyto provide increased resilience in the bubble portion 82, to permit itmore readily to spring back to its original as-molded position.

Attention is now directed to the movement of the vent-valve 28 as themechanism moves between the FIG. 5 position and the FIG. 6 position. Inthe FIG. 5 position, the probe member 52 rests lightly against themushroom-like cap 109, and does not interfere with the tendency of thelatter to urge the enlargement 108 into sealing relation with the secondaperture 31. As the trigger S6 is moved leftwardly to bring the firstswingable member 16 closer to the plate portion 15, the probe member 52pushes downwardly against the mushroomlike cap 109 and in so doingpushes the stem 106 downwardly with respect to the plate portion 15.Downward movement of the stem 106 brings the enlargement 108 out ofsealing engagement with the second aperture 31, and the vent-valve 28reaches an intermediate position shown in FIG. 7, in which theenlargement 108 is displaced downwardly out of sealing relation with thesecond aperture 31, and in which the mushroom-like cap 109 is partiallyflattened but not so as to obstruct the passage of air beneath themushroom-like cap 109 and through the now opened second aperture 31, asshown by the flow arrows.

Further downward movement of the probe member 52 pushes themushroom-like cap 109 downwardly into the counter-sink at 32, as shownin FIG. 6. Alternatively, the probe member 52 could be shortenedsomewhat so that in its lowermost position the vent-valve 28 ispositioned as shown in FIG. 7.

As shown in FIGS. 1, 5 and 6, the spray barrel 52 fits snugly over the.pencylindrical channel 104 and the elongated member 65, the grip beingsuch as to prevent leakage of the liquid.

It will be noted in FIG. 1 that the spray barrel 22 is provided with afirst key 1 16 and a second key 118, the

two keys extending in opposite directions at two locations spaced alongthe spray barrel 22.

In FIG. 2 it can be seen how the spray barrel 22 with the keys 116 and118 can be used to lock the trigger 56 and the second swingable member20 in the open nonpumping position, should this be desirable forpurposes of handling or shipping. The grip of the spray barrel 22 aroundthe pencylindrical channel 104 is not so tight as second embodiment, theshroud 97 is moulded integrally with the plate portion by means of aconnecting strap 120. The remaining parts of the assembly are unchanged.

In putting together the assembly shown in FIG. 4, the integralelastomeric member 80 is fitted snugly into the shroud 97a while bothare in the inverted position shown in FIG. 4, and then the shroud 97awith its contained elastomeric member 80 is pivoted around to lodgesnugly between the curved positioning ribs 34. The remaining steps ofassembly are unchanged.

It will be noted in H08. 5, 6 and 7 that the vent-valve 28 has a centralbore extending from the middle of the mushroom-like cap 109 to alocation within the stem at approximately the position of theenlargement 108.

This bore is not essential, but arises because of the moulding techniqueused in making the vent-valve 28.

It is to be understood that, while the vent-valve 28 has been disclosedas a separate item mechanically operated, it would be a simple matter toconstruct the vent-valve in such a way that the increased pressuredeveloped inside the elastomeric member '80 on the downstroke pressesthe ventvalve downwardly to open the second circular aperture 31. Forexample, the ventvalve could have the periphery of its mushroom-like cap109 sealed against the flat upper surface 29 and vent air could becommunicated to the underside of the cap 109 by a lateral bore centrallybetween the surfaces of the plate portion 15.

It will also be appreciated that the breather ribs 36 can be replaced bysuch expedients as providing at least one hole in the cap 109, a lateralbore in the plate portion 15 as mentioned above, or serrated edges onthe cap 109. I

The vent-valve 28 and the elastomeric member 80 are preferablymanufactured from a material marketed the pump means including a probemember adapted to move toward and into displacing contact with said capin the general direction from the cap to the enlargment as the pumpmeans is activated, thereby to unseal the said aperture and permit thepassage of fluid therethrough.

2. The combination claimed in claim 1, in which the enlargement taperssubstantially conically toward the cap, and in which the aperture has acircular cross-section with a diameter less than the maximum diameter ofthe conically tapering enlargement.

3. The combination claimed in claim 2, in which the vent-valve is asingle integral item of resilient material.

4. The combination claimed in claim 3, in which the plate portion hasdiscrete, raised breather ribs adjacent the aperture on the side remotefrom the enlargement, the breather ribs being disposed to contact partsof said cap, thereby to permit the free passage of air at all timesbetween the cap and the plate.

5. The combination claimed in claim 4, in which the aperture iscounter-sunk on the side of the plate portion remote from theenlargement.

6. The combination claimed in claim 1, in which the pump means includesa first swingable member pivoted to said plate portion about a firstpivot axis remote from said aperture and adapted to swing toward andaway from said vent-valve on the side of said plate porby Shell Oilunder the Registered Trade Mark v the spray barrel 221 and the spraynozzle 24 .is

polypropylene, with High Density Polyethylene, as a satisfactoryaltemative'.

What we claim is: I 1. In combination:

a container having pump means for pumping the contents of the containerfrom the interior to the exterior,

said container. including a plate portion separating the interior ofsaid container from the exterior thereof, said plate portion having anaperture therethrough, I

a vent-valve having a stem extending loosely through said aperture, thestem having on one side-of the aperture anv enlargement convergingtoward the aperture and adapted to seal the aperture, the stem having onthe other side of the aperture a resilient mushroom-like cap of whichthe periphery extends outwardly and toward the plate-like member andbears against the plate-like member,-thereby to bias. the enlargementinto sealing relation with the aperture,

.tion remote from the enlargement, a second swingable member pivoted tosaid first swingable member about a second pivot axis parallel to saidfirst pivot axis, said plate portion rigidly supporting pin means spacedfrom said first pivot axis, said second swingable member having slotmeans adapted to receive said pin means and to establish sliding pivotalmotion thereabout, thereby to permit said first swingable member to movetoward and away from said plate portion as the second swingable memberis slidingly pivoted about said pin means, the first swingable memberhaving a probe member adapted to push the vent-valve cap toward the saidaperture as the first swingable member approaches said 'plate portion,the second swingable member having trigger means by which it can bemanually rotated to bring the first swingable member toward theplate-portion.

7. The combination claimed in claim.6, in which said J pump meansincludes a depressable pump located on said plate portion and having apart adapted to be moved toward the plate portion by an outside agency,

said last-mentioned part being adapted to restore itself upon cessationof the outside agency, said first plate portion also having apush-member adapted to move said part toward the plate portion as thefirst swingable member moves toward said plateportion.

8. The combination claimed in claim 6, in which the I plate portiondefining said first side, the second side

1. In coMbination: a container having pump means for pumping thecontents of the container from the interior to the exterior, saidcontainer including a plate portion separating the interior of saidcontainer from the exterior thereof, said plate portion having anaperture therethrough, a vent-valve having a stem extending looselythrough said aperture, the stem having on one side of the aperture anenlargement converging toward the aperture and adapted to seal theaperture, the stem having on the other side of the aperture a resilientmushroom-like cap of which the periphery extends outwardly and towardthe plate-like member and bears against the plate-like member, therebyto bias the enlargement into sealing relation with the aperture, thepump means including a probe member adapted to move toward and intodisplacing contact with said cap in the general direction from the capto the enlargment as the pump means is activated, thereby to unseal thesaid aperture and permit the passage of fluid therethrough.
 2. Thecombination claimed in claim 1, in which the enlargement taperssubstantially conically toward the cap, and in which the aperture has acircular cross-section with a diameter less than the maximum diameter ofthe conically tapering enlargement.
 3. The combination claimed in claim2, in which the vent-valve is a single integral item of resilientmaterial.
 4. The combination claimed in claim 3, in which the plateportion has discrete, raised breather ribs adjacent the aperture on theside remote from the enlargement, the breather ribs being disposed tocontact parts of said cap, thereby to permit the free passage of air atall times between the cap and the plate.
 5. The combination claimed inclaim 4, in which the aperture is counter-sunk on the side of the plateportion remote from the enlargement.
 6. The combination claimed in claim1, in which the pump means includes a first swingable member pivoted tosaid plate portion about a first pivot axis remote from said apertureand adapted to swing toward and away from said vent-valve on the side ofsaid plate portion remote from the enlargement, a second swingablemember pivoted to said first swingable member about a second pivot axisparallel to said first pivot axis, said plate portion rigidly supportingpin means spaced from said first pivot axis, said second swingablemember having slot means adapted to receive said pin means and toestablish sliding pivotal motion thereabout, thereby to permit saidfirst swingable member to move toward and away from said plate portionas the second swingable member is slidingly pivoted about said pinmeans, the first swingable member having a probe member adapted to pushthe vent-valve cap toward the said aperture as the first swingablemember approaches said plate portion, the second swingable member havingtrigger means by which it can be manually rotated to bring the firstswingable member toward the plate portion.
 7. The combination claimed inclaim 6, in which said pump means includes a depressable pump located onsaid plate portion and having a part adapted to be moved toward theplate portion by an outside agency, said last-mentioned part beingadapted to restore itself upon cessation of the outside agency, saidfirst plate portion also having a push-member adapted to move said parttoward the plate portion as the first swingable member moves toward saidplate portion.
 8. The combination claimed in claim 6, in which the firstswingable member is biased away from the plate portion.
 9. Thecombination claimed in claim 1, in which the plate portion constitutesone side of a triangular linkage in which the first and second sides areof constant length and the third side is of changeable length by virtueof a pin-and-slot connection with the first side, the plate portiondefining said first side, the second side being defined by a firstswingable member pivoted to said plate portion at the vertex betweensaid first and second sides, the third side beIng defined by a secondswingable member pivoted to said first swingable member at the vertexbetween said second and third sides and slidably pivoted to said plateportion at the vertex between said third and first sides, the secondswingable member having an integral trigger which may be moved digitallyto swing the first swingable member closer to said plate portion, saidprobe member being supported on said first swingable member.